A charging equalization control method for series battery packs based on multi-coil transformers

Abstract

The present invention discloses a battery pack balanced control method based on a multi-coil transformer. According to the method, a public energy storage reservoir is set up in the charge-discharge process of series batteries; batteries with relatively high capacities input energy into the energy storage reservoir; and batteries with relatively low capacities adsorb energy from the energy storage reservoir. The input or adsorbed energy is measured by difference between the capacities or voltages of the batteries and a reference value; the larger the difference between the capacities or the voltages of the batteries and the reference value is, the more the input or absorbed energy is; and conversely, the smaller the difference between the capacities or the voltages of the batteries and the reference value is, the less the input or absorbed energy is. The energy storage reservoir is a multi-input multi-output multi-port energy reservoir, can simultaneously adsorb energy from a plurality of batteries with high capacities and also can simultaneously output energy to a plurality of batteries with low energy. Energy balance among battery monomers in a series battery pack is realized in an energy converting and deploying manner.

Description

technical field [0001] The invention belongs to the technical field of charging and discharging of lithium batteries, and relates to a charging equalization control method of series battery packs based on a multi-coil transformer. Background technique [0002] There are many charging equalization control methods for series-connected battery packs, each with its own characteristics and processing methods, and suitable for different objects, most of which are suitable for small and medium-sized series-connected battery packs. From the above typical control methods, it is obvious that the non-energy-consuming equalization control technology is the future development direction; the energy conversion type will have higher equalization efficiency than the energy transfer type, and the balance control time will be shorter; two-way equalization faster than unidirectional. The energy involved in the balance is transferred or exchanged between adjacent batteries, such as using "flyin...

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Problems solved by technology

[0003] However, these non-energy-consuming equalization control methods, whether they are transfer or conversion, have a large number of control switches, large current and voltage stress, and complex control logic.

For equalization between adjacent batteries, when the number of batteries is large, the equalization time is long; using multiple secondary coil transformers or a single transformer can achieve one-to-many equalization and improve the equalization speed, but only one-way equalization control can not be achieved Direct balance control between many-to-many batteries, balance energy cannot realize many-to-many exchange according to their own needs

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